Since Google's own FAQ pages, Google's own forums, Chrome FAQ pages, etc. don't seem to be sufficient enough to provide timely answers to the OP, we'll throw the floor open to whatever discussion arises--but in the Castle Break Room, not out in the real forums where this topic is all but pointless.

Now days there are lots of seo extensions are available in google chrome webstore. But according to me instead of using freaky extensions go for verified one's.
That are SEO quake. Just type this on google webstore and you will find this extension easily.

Well i don't think that Google chrome provides as much plugins as Firefox but there are some.I have SEOquake which shows Google pagerank,Yahoo links,Alexa rank,nofollow link,bing index e.t.c.I think it is good plugin.